For the large majority of Christians, the Holy Spirit (or Holy Ghost, from Old English gast, "spirit") is a member of the Trinity: The "Triune God" manifested as Father, Son, and Holy Spirit; each aspect itself being God. Two symbols from the New Testament canon are associated with the Holy Spirit in Christian iconography: a winged dove, and tongues of fire. [non-primary source Each depiction of the Holy Spirit arose from different historical accounts in the Gospel narratives; the first being at the baptism of Jesus in the Jordan River where the Holy Spirit was said to descend in the form of a dove as the voice of God the Father spoke as described in Matthew, Mark, and Luke ;the second being from the day of Pentecost, fifty days after Pascha where the descent of the Holy Spirit came upon the Apostles and other followers of Jesus Christ, as tongues of fire as described in the Acts of the Apostles 2:1–31.
Called "the unveiled epiphany of God", the Holy Spirit is the one who empowers the followers of Jesus with spiritual gifts and power that enabled the proclamation of Jesus Christ, and the power that brought conviction of faith.
On the last day, that great day of the feast, Jesus stood and cried out, saying, "If anyone thirsts, let him come to Me and drink. He who believes in Me, as the Scripture has said, out of his heart will flow rivers of living water." But this He spoke concerning the Spirit, whom those believing in Him would receive; for the Holy Spirit was not yet given, because Jesus was not yet glorified.